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Finding the Fourth Proportional to 766.11, 1,057.21 and 434.55

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Solution

The fourth proportional to 766.11, 1,057.21 and 434.55 is: 599.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.11 : 1,057.21 = 434.55 : x
  2. Step 2: Convert to fraction form
    766.11/1,057.21 = 434.55/x
  3. Step 3: Cross multiply
    766.11x = 1,057.21 × 434.55
  4. Step 4: Simplify right side
    766.11x = 459,410.61
  5. Step 5: Solve for x
    x = 459,410.61/766.11
  6. Step 6: Final answer
    x = 599.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.